City
O'Fallon, IL
St. Clair County, Illinois · Population 32,262 · 1 ZIP code
Population
32,262
Safety Score
50
50
Average
Livability
50
50
Average
Median Home Price
N/A
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About O'Fallon
O'Fallon is a city located in St. Clair County, Illinois. With a population of 32,262, it spans 1 ZIP code.